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TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent and use method thereof

A metallographic sample preparation and etching agent technology, applied in the field of metal materials, can solve the problems of incomplete display of grain boundaries, poor picture quality, and indistinguishability, etc., and achieve simple cleaning agents and cleaning methods, improve TW quality, and clear grain boundaries Effect

Inactive Publication Date: 2013-02-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In "Microstructure and Properties of Fe-Mn-C TWIP Steel" ("Shanghai Metal", vol.29, No.5), there is no mention of the metallographic sample preparation method, but the picture quality is very poor, and the grain boundaries show incomplete
[0009] "Microstructure and wear properties of alloyed high manganese steel" ("Modern Machinery", 2001.2), did not mention the method of metallographic sample preparation, but the quality of the photos in the literature is poor, basically indistinguishable
[0010] According to the comprehensive retrieval of literature, the preparation method of metallographic samples of TWIP steel (or high manganese steel) is mainly based on different concentrations of nitric acid alcohol, and the effect is not good.

Method used

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  • TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent and use method thereof
  • TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent and use method thereof
  • TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent and use method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking undeformed Mn18 steel as an example, immerse the polished metallographic grinding surface in a volume ratio of 1:0.5:100 nitric acid (37%)+hydrochloric acid (69%)+alcohol etchant for 45 seconds. Then put it into the cleaning agent of hydrochloric acid (37%) + deionized water with a volume ratio of 0.4:100, clean it with ultrasonic vibration for 60 seconds, and dry it with a hair dryer to make a metallographic sample.

[0032] Effect see picture description figure 2 . The grain boundaries are complete and clear. In the case of little contrast between grains, there are no undisplayed grain boundaries, and the annealing twin grain boundaries are obvious.

Embodiment 2

[0034] Taking undeformed Mn25 steel as an example, immerse the polished metallographic grinding surface in an etchant with a volume ratio of 1.8:0.2:100 nitric acid (69%)+hydrochloric acid (37%)+alcohol for 60 seconds. Then put it into the cleaning agent of hydrochloric acid (37%) + deionized water with a volume ratio of 0.2:100, clean it with ultrasonic vibration for 75 seconds, and dry it with a hair dryer to make a metallographic sample.

[0035] Effect see picture description image 3 . The grain boundary is complete and clear, and there is no incomplete grain boundary, and the annealed twin grain boundary is also very obvious.

Embodiment 3

[0037] Taking the deformed Mn18 steel as an example, immerse the polished metallographic grinding surface in an etchant with a volume ratio of 3:0.4:100 nitric acid (69%)+hydrochloric acid (37%)+alcohol for 50 seconds. Then put it into the cleaning agent of hydrochloric acid (37%)+deionized water with a volume ratio of 0.3:100, clean it with ultrasonic vibration for 80 seconds, and dry it with a hair dryer to make a metallographic sample.

[0038] Effect see picture description image 3 . It clearly shows that the contrast between different grains due to the deformation texture is increased, the grain boundaries are clear, the annealing twins can still be distinguished, and the dense deformation twins are also very clear.

[0039] Using the etchant and method of the invention to prepare TWIP steel metallographic samples has the advantages of clear structure and complete grain boundaries compared with conventional metallographic sample preparation methods. This method is also...

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Abstract

The invention discloses a TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent. The TWIP steel metallographic phase specimen preparation agent comprises an aggressive agent and a cleaning agent, wherein the aggressive agent is a mixed solution of nitric acid, hydrochloric acid and alcohol in volume ratio of (1-3):(0.2-0.5):100; the cleaning agent is hydrochloric acid solution in a volume ratio of (0.1-0.4):100. Polished metallographic phase grinding surface is dipped in the aggressive agent to keep for 40-80s; after the specimen is taken out, the specimen is directly put into a flask containing the cleaning agent; the specimen is put in a supersonic cleaner to oscillate and clean for 60-80s; the specimen is taken out and is cleaned for 20-40s in warm water with the temperature of 50-70 DEG C; and after the specimen is blown to be dry, an metallographic phase observation can be performed.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and specifically relates to a TWIP metallographic sample preparation agent and a use method thereof, which can make the metallographic structure of TWIP steel clear and the grain boundaries and twin grain boundaries complete. Background technique [0002] With the tense energy supply and the continuous increase of environmental pressure worldwide, the automobile industry is urged to develop towards lightweight in order to achieve the goals of energy saving, consumption reduction, environmental protection and safety. [0003] The lightweight of automobiles requires high-strength, high-plasticity, and toughness steels for automobiles. In order to meet this requirement, steel companies have introduced dual-phase (DP) steels, phase transformation-induced plasticity (TRIP) steels, and complex-phase (CP) steels. High-strength steels and twin-induced plasticity (TWIP) steels with high manganese ...

Claims

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Application Information

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IPC IPC(8): G01N1/34G01N1/32
Inventor 徐荣杰刘仁东郭金宇王旭王科强魏世同吕冬
Owner ANGANG STEEL CO LTD
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